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Spring Boot startup time: bean-by-bean diagnosis, and one directory per post

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Adds spring-boot-startup-time/, the companion project for BLOG-618: a runnable
Spring Boot 4.1.1 application on JDK 25 that installs BufferingApplicationStartup
and FlightRecorderApplicationStartup behind a system property, and a /diag/startup
endpoint that computes step self time -- the number /actuator/startup does not give
you and the one that names the actual culprits.

Captured under docs/output/: the step tree sorted both ways, the same startup as JFR
events, a +5000-class experiment putting 0.11 ms per scanned class on the classpath
scan tax, the silent truncation a 2048-step buffer performs, and JDK 25 AOT cache
timings (6.93 s to 4.82 s). Post body and metadata live in post/.

Moves the existing Actuator project into actuator-in-production/ so the repository
holds one directory per article; the root README is now an index.
This commit is contained in:
Ankur Mhatre
2026-09-04 23:58:38 +05:30
parent 4b6cefa60a
commit 958b401f0f
112 changed files with 2744 additions and 154 deletions
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actuator-in-production/docs/output/00-versions.txt Normal file
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$ java -version
openjdk version "25.0.4.1" 2026-08-18 LTS
OpenJDK Runtime Environment Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS)
OpenJDK 64-Bit Server VM Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS, mixed mode, sharing)
$ mvn -v | head -3
Apache Maven 3.9.11 (3e54c93a704957b63ee3494413a2b544fd3d825b)
Maven home: /tmp/tools/apache-maven-3.9.11
Java version: 25.0.4.1, vendor: Eclipse Adoptium, runtime: /tmp/tools/jdk-25.0.4.1+1
$ mvn dependency:list -- the resolved versions behind spring-boot-starter-parent 4.1.1
com.h2database:h2 2.4.240
io.micrometer:micrometer-core 1.17.1
io.micrometer:micrometer-registry-prometheus 1.17.1
org.apache.kafka:kafka-clients 4.2.1
org.springframework.boot:spring-boot 4.1.1
org.springframework.boot:spring-boot-actuator 4.1.1
org.springframework.boot:spring-boot-health 4.1.1
org.springframework.boot:spring-boot-restclient 4.1.1
org.springframework.security:spring-security-core 7.1.1
org.springframework.security:spring-security-web 7.1.1
org.springframework:spring-core 7.0.9
org.springframework:spring-web 7.0.9